Grate



June 5, 1923.

G. A. MMKENZIE GRAT E Filed Apiil 2s 1919 2 SheetsSheet l 1919 2Sheets-Sheet 2 G. A.--M KENZ|E GRATE Filed April 28 June 5 (UNITEDjGE'ORGE am-sa e. or m orry Io IGA1\T; f

Patented June 5, 1923.

1 GRATE.

Application :filed n ruas, 1919;, Serial No. 293,349. b i

To all whom it may co'n'cem:

Be it known that I, G ORGE A. Mao- KENZIE, a citizen of the UnitedStates of America, residin at Bay City, in the county of Bay anfistateof Michigan, have invented certain new and. useful Improvements inGrates, of which the following is a specification.

This invention relates to grates for an naces and the like, adapted foruse with furnaces particularly of the down draft type.

An object of the invention isto provide a grate which will readily burnany grade of fuel and which will leave nothing but a. very fineashadaptedto naturally fall from the grate and into the ashpit.

Another object is to provide a suitable grate support upon .whichthegrate proper is carried, and byo'scillation of which the entiregrate-structure .may be raised or loweredthrough instrumentalityof anannular cam shoulder or support formed on the inner surface ofthecombustion chamber.

A still further object islto provide means for 'pre-heating air-andintroducing itc'to the grate to assist in consuming the soot andcombustible gases which are ordinarily exhauste d out of the chimney orexhaustflue. These and other objectswill appear as't-he' discriptionproceeds. In the drawings which I have illustrated the preferred embodiment of my invention, and *wherein similar reference charactersdesignate corresponding parts throughout" the [several Figure 1 ,is a.:vertical'sectional view of my downdraft furnace, showing my improvedgrate in positiontherein. 1

, Figure .2 is a plan view of the grate proper.

Figure 3 is a section. taken on" the line- 3- 3 of Fig. 2'. I p

View of the grate sup- Figure 4 isa plan port. i I Figure 5 .is a planview of the cover for the grate support.

Figure 6 is a'fragmentaryside view, showing a fragment, ofthe grate andits support.

igure 7 is another side view showing a fragment ofthe cover and thegrate without the grate support.

Figure .8 is a section taken on 8-8 of Fig. 2. I

Figure 9 is a detail sectional view of one ofthe radiating arms of thegrates.

Referring to the drawings, in which I illustrate my improved-grate -asappliedto a downdraft furnace, the grate; 1 is seated.

and carriedon the grate support Qwhieh is positioned withinand carriedby the com: busti'on chamber 3, and while I..show the grate as beingsupported by the walls of the combustion chamber, it will be readily Iunderstood that any other suitable means for accomplishing this may beemployed and stilllie within the scope ofmy invention;

) .Thegrate proper has as clearly shownin Figure 3 of the drawings,anopening -t-i1i the center th'ereof, in which the plug. or, member 5-is' seated, said member having shank 6 adapted-to fitthe opening 4: anda, 1 head 7 which extends up'wardlyand is coni-f cal in shape, andisdesigned to prevent the fuel from wedging and packing on thesurface. of"the grate and; to allow the ,air to circulatethroughthe fuel.

,"Radiati-ng from the centerof the grate aplurality of arms8,terminatingin a ring- 9 cast integral with the grate, and provided withf'downwardly projecting concentric, flanges 10 and 11 formed on'th'eunderside thereof. i

The gratesupport is alsoan'nularin form,

lyand communicating with the outer air.

. having a hollow hub member .12, which is I adaptedto'be slidablyseated onthe hot-lair pipe.1-3,.the said pipe extending downward-Radiating from this'hollow hub memberl2 are thearmsgl t, extending to an,annular air passage 15,;lwhich isifornledby the upwardly'extendingconcentricflanges l6 and l7,jt-h'eouter fiangelfi being of greater height; than the inner flange, and-fitting against the inside of the outer.fiangell formed onthe underside of the grate 1 said flange 16 having .aseries of notches"1 6 formed thereindesignedjto 'allo w'airto es,

tially as shown .inFig. 9 ofthe drawings,

cape into. the combustion. chamber ofthe; furnace. The'armsld are formedsubstan- 20 'on the inner wallofthe-combustion chainher 3.' The shoulder20 has spaced notches or recesses 20*- with inclinedsides and providesan undulating. or cam traokway. to

raise the grate 1 when the latter is turned are or cap for the hub andthe perforated.

I grate.

or oscillated to provide sufficient space beneath the grate to removeslate or other foreign matter from the surface of the grate, the grateotherwise being self cleaning as the fine ash will readily falltherefrom.

Seated and carried on the arms 14 of the grate support is the cover 21,forming a closthrough which the pro-heated air is adapted through thepassages in the to escape into the combustion chamber, and it will beapparent that the grate proper is seated on and carried by'the flange'16 and the cover 21 is supported on the flange 17.

The air is introduced into the furnace 25 through the air passage orpipe l8,'which extends into the ashpit 26 and up into the combustionchamber 3 of the furnace, and it will be obvious that the heat in thecombustion chamber will readily preheat the air asit flows'to the grate.The air flows grate and its support as above pointed out, and into thecombustion chamber 3 around the outer edge of the grate proper andinwardly toward the interior of the grate; thence circulating up andinto the fuel to assist in the'complete consumption of all soot andcombustible gases, and, in actual practice leaving nothing but a veryfine ash which will readily fall through the grate. To shake the grate asuitable implement is engaged with one of the legs 19 and moved back andforth horizontally, whereby the legs 19 ride over the cams of shoulder20 and raise-and lower'the grate.

From the foregoing description it will be obviousthat I have perfectedsimple and 1 economical grate. wh ch will burn any grade of'fuel andwhichcanbe quickly and easily removed in sections when desired.

\Vhat I claim is:

1. In a furnace, a grate body having spaced depending flanges, a supportfor said grate body having hollow arms and a hollow ring mounted ontheouter ends of the arms and communicating therewith, said ring havingan upstandingflange adapted tofit against one of the flanges of saidgrate body and the flange of thering having openings therethrough,a'cover for closing the upper sides of said arms and having a flangearranged to engage the other flange of the grate body 'and'havingopenings therethrough, and means for placing the hollow arms incommunication with a source of heated air.

2. In a furnace, a grate body having depending spaced'flanges, a supporthaving hollow radial arms with a hollow ring support on the outer endsof the arms and pro vided withan upstanding flange at the outer edge ofthe'ring, said arms and ring being open at their upper sides, and aremovable cover arranged to seat over said arms and having an upstandingflange at theouter edge of the cover spaced inwardly from the flangeofthe 'ringand forming a continuation of the ring, said flanges of thering and the cover having openings therethrough to permit air toesoapefrom the ring and said last named flanges beingadapted to engage"with the flanges of: the grate body and to support the latter.

3. In a furnace, a gate body, a support for said grate body comprisinghollow radial arms and a hollowring carried uponthe outerends ofthe'arms and communicating therewi.th,'a removable cover part for saidarms and ring, and the cover part and the ring having upstanding spacedflanges froming an annular air space above the ring and the flangeshaving openings therein through which air may pass, said flanges beingadapt-.

ed to receive the grate body thereon for supporting the grate body'andfor distributing air therebeneath. V In furnace, a gratebody havingspaced annular depending flanges,a support for said grate bodycomprising a plurality of radially disposed hollow arms and a hollow'ring carried upon the outer 'endsof the arms and communicatingtherewith, said ring having its outerwall extended upwardly andproviding a flange adapted to fit'between the depending flanges of thegrate body for supporting the latter, a cover for the hollow arms havingan annular up standing flange forming a continuation of the inner wallof the ring and arranged to fit between said depending flanges of'thegrate body to support the same, and means.

for placing the hollow arms in communication with a source of heatedair, said 'jflanges of the ring and cover having openings in their upperportions for distributing the heated air beneath the grate body.

In testimony whereof afiix my signature.

enonon A. MACKENZIE.

